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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8c3bd6d67eae593282058d72f5467f5454ada160ae28919c090686a79fbe7133' 
  AND token = 'c5XEHdn1QDeB0sgejo/L5O7yGjy4uCKwzj0IL22csoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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