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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd4ce7d08ceb2e58f80917fbf4a1eb6f0f396979acece80e29f7d16a929c989f2' 
  AND token = 'bpEW8ZizjngvM8t1I4FwKi6fnFrjJtWJNZfrftLMbSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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