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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '26977cbf2c30f373340fbc72589beb908a32acea6c5c372878d3df5dc37e7999' 
  AND token = '1LeeXKLoCJCrChhesc47921JoJQyfc0GDgO/AEUeGk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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