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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8cc52672251bd27232e71945e93da0c4d2f7491b86dec9bf605c910fae0af84f' 
  AND token = 'j/dDh6A9y4trY7WBCShcLAiigg4odEcF4wNelSM0CFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}