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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1d107d1cff0b91c3cee1fa1f256421acfebd97392aae45207ea38cb5ba70c21' 
  AND token = '32n0MMXW+ZYzH4CrcgFnyZtz7padDXDN3YwlzVWrZ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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