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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '93c8b2358472ef4ca871e48cdb0891383080d3eeec08f424a8ffd4a56f3fb755' 
  AND token = '/5vQrNeimeHaR7P/LAotHlcLkwrL5MJ/M3DehnnI5q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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