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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e33e0b7e705f1294bc656556a5e9897f8059ebe2a2399d153e3da2aa46579c0' 
  AND token = '0KwFleJScbijtN9Q4bxsFw4BIHl2qclIHI3Me03kvjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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