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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5a1c063efc66188fc1bd5ac50972dd3f0b37db843564b67b791803787ff19374' 
  AND token = 'tYyOTaofE8kMglj3Lvr6egxktkhaDRyfGPwl7AkvXWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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