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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b2f8e1da60c95834f215be9c2bbb702e306c009048689e607d54de639ab8290f' 
  AND token = 'Z5v5BqF2EpeZfS0OU9vjyp21JpEWzcPjOMAFUKK0gQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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