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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7131b251ed6844fd2149323ccd4b094f7f33c1cfd8681d99c38472828c28ffad' 
  AND token = 'SPRYAcxit0YhEevFclwjWqiYzA5CIE8foFGHj1pGFUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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