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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8e5406bb7a185bccdaa7bddf453ebf75b46d6398522f6904188ec0bc6ca7cf0' 
  AND token = 'FeRvOBSOOLzrlkYVMT7c9/ehDBU4xGX8I0JBA5chqaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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