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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '63bb0fad167be0c5939ededc1b3da96fecd21edc74dc01208009589dd8516ed4' 
  AND token = '02cacoj9dLhS+2e9babzI4Nh0PvI2ntXb2iAvPrWk84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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