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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63e19ca288d9943c2217c9191cabaa55e13953192151abaae2ef73f62589862a' 
  AND token = 'jOWhYkMtdkjCEb0MBllzdcQ3URSYJh3CVDduBQE8M6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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