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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02e55e5416535346bfe4890db31ff24428ef0b711c3b026c510b2829b255ddcd' 
  AND token = 'ngkVFB6iCd8HLqcWfXYFd0DG72sw+n855D2i8R9GCsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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