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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a32aeb623a602eee6f3e8da4af6bfb43ba1044d4b16d4d7f3f02c9d664ea0ea0' 
  AND token = 'xE2Ef2BGSqJz2gXnw6Mgt8Ph5I2ZRD7gFzpzVoCrjeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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