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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5bf4d2b332061b2edf48eee07c64e4cd2ba1792fbeb914921f51e834f69d5c0' 
  AND token = 'NuCpdqAm7y64OqnnSIxuntTN9Es4qkUtCxG1/I7cG74=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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