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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc29a9551e9844b2be2b5f72c2a84fcdecd83e286f2a91ac3ea58ac41c72ddcf' 
  AND token = '8xkCna/Sl7cnJJE5lemSU9wd3IhA3ucRTjvJvBeLsbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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