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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ebb5fa23ef760bd0422e0b941f1ed452a4ca10576719659166c0d715f58b13b' 
  AND token = 'hhk9w8NutjeUdVFqe7R3qNUIymU0Tui3R/ucfSy2JMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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