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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '340b0f93a0fc20f28065fa713b45c323246bc05e86cb927d32802423fb7d25ef' 
  AND token = 'woFQUeoYHmWTuSCV0+r6d2cjVxDdEaK7paTu1ywykGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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