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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b88cca5b41ad60a49300d50e77cfe0b522eacd86f4aa43bf3e45f602f3eaeebb' 
  AND token = 'AT/ojMTlB4uwrgfah/TNHpmzOZBzoQLSuQAee5P21Dg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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