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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4473b20ac4e1c4a8cfd41f760749f242b8219fb472afac307ed39430f8502b1c' 
  AND token = '7yP+h9Ve7/dchPB8oa0o+Jr7U3CQOMbzRPppWZmDB7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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