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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '67033a3a62f9d0a3c5f811ef0147b2cc1a07fb20d3811941bc86a7730e6c782c' 
  AND token = '/CFJ7agBDcTR9MvZPNN77F51HcozzPHrrs0hm4snabE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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