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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '514394f8aa7fba0b7f41aafd7130a443c3152dc958ca436038906ae7bb2340f6' 
  AND token = 'XuEOPhQdESQA65JtyXC5WSf8OK/L2CNanTsopYM0WBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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