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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1bd793bea2f3d964bd54bb08d1e851d838922434352943a0de52e2881d544bbc' 
  AND token = 'imEI3TgB5qtrG0rR40OZvYcPkjX4HED2V4e9NAEqXjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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