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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7baf135b4d1e1d8a48caab702e7ccada0cecef9b1c1ee4f018bbd2970278559c' 
  AND token = 'guwAWhQsQdv00WYJ6s0uS7jMN8TQILgQHbsU9QZ20Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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