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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a5f02edfaa1cefbb3f961bc5a4d6ff18bf7e32da31bdfcca1f4fe3bc03115e94' 
  AND token = 'xjno4D9MHX97nFB7q4m5Lr6E7Wn31Nmcee6AKtnqiTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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