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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afac0ba56da354bcb559dabc153b6965d686e3afbabd9c24bdd8ad6ba0534b4b' 
  AND token = 'ND+uM2I+FzzIVNzrTt/N0xlO5TW09xm/6lyWlm5rR3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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