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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0ecfa67f47672e9892ecb314cae8816f9b5fbfa242707506ff38ac6ba47d0592' 
  AND token = '91WR7cZGS1bDukddFV7f9yZ2IyOzOq5HSbbLF8OnqE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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