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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6ae816cabff3e0d4216cea5bfc6dbb2c66d1881e9a1e1de7fb0d9ef092f02fa' 
  AND token = 'epodPNG1LUZkYiG/AUXHmQSJKnHedZTxksRSQ7dNQks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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