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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cb3bb3a204bc589c14c1e37a619c7f00d8b4d0fd8273a8118a2ef85585c3dc48' 
  AND token = 'VE1G42E+kDkG3V1mb38EGA06fxx4nKqVZc8DI0Jf4s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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