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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'daba483f446e35edeb94492fc5d32d57b767721749a459228a721044d2e2e560' 
  AND token = 'F2LXdoK1HyESUxcUJtUYADAStiiUZyXKK+4AcA0XPNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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