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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1551819f9e37d0fd5249d4ba5ff0930a0118b9526697a9678e00ddefca216941' 
  AND token = '7U1aI13t/Bk063pBGj1qYqgHr1HNC2T6U6J/QXQi1Wc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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