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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d2c4f27087ea6d18eea76ac6a82107fdd504d01ad8dbabf9f9e6e1a28504b4e' 
  AND token = 'atUtuUxtR9dmkQQWt0Vm+nPVxuFTt8xcHdGSVwcQwUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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