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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a47d063f2baf9ce507eb134bcd72fbdc5c64f515b5a0163cf1b43cf025c31018' 
  AND token = 'ZxJz9HdYLSaMleTMf7ZrxYBDBmBc74Y+7Is4RmG8Sec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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