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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fe6fa5c19f6a2a5e9e23131ad77e9f6f2f9ad75867fe9571146663b6403e6a8' 
  AND token = '4w2JbPL5BuSlI8pbK/f9s6x7uSAXPtRb66nFxvfFqro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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