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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '236c3fd9de6a06ab6be9486f051f54b1531b92825e05511058531aa0a02b0a4b' 
  AND token = 'pE4zoYq4o7tYAec1tPGNe4mtGx8Mz2ld8p3vr0yrCyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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