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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '10eae0a4a23796c24be84b0e70a4eb008630bee68fd67e3b6163a3fbd7e48979' 
  AND token = 'Hxg7DcQyRorp3P/eJqjqvgKOB3eOuAoS+NG5wmHZa7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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