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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4059ac81e8712111d57ca4b97e3c54b3372184fab08a5e7520013b3d51db5a7e' 
  AND token = 'XnD9S127rRqAWO2ALuBSKZCPsYXoIHs17e4Ha3VRdAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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