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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '08bb535c50fdda096d94338b1cf1f004159854fbaf29af401a445f5b0c7e4b5b' 
  AND token = '6BP/e6jLeHdjBKtpoOGukREyMZ4g1V2KGaES0sg9Rtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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