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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e231e5e45d74b6c6fcd5c2b4913023a98614a0e26ef4e13841f0ea7ac24f8df1' 
  AND token = '26u21b7nPBAX72dWPmtIavmyzjTgPePTipUI9DDQEcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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