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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '619bc08fb7a46a470078b7f41f12f4f8f13bf9ecae46fd150464bd9bf6f33541' 
  AND token = 'hUnISXs4kXmPISPQi8pOFNHRffNweTIXkziLoMhtSJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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