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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '823db2f1230ae8d2d7753acea08dfa3069ea46a8a0153e1536ec172b4f571e61' 
  AND token = 'iAQr8RbtyGGpIv/88lWo+BZtL/Z/jBM01v2A6psx3gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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