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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b9eb8f8d1770802ca7a668e44b1d025fe6569117cfa81fd4ddb504c24ab720c' 
  AND token = 'q3BFHtkpIRE+bMKkP3PgEdyeCxVyQcw2t/k2Tej2m1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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