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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dcad13def3d6bafce028d0810db63db4c48ead277180c9d1ac185880a1a31af7' 
  AND token = 'tWnJ1knytvJP2CDhrjA7SPeuTjMNHDFB5xbJO4nIVb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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