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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '694a55e89c0a8561196183050524b681ade0e16e63ed8157912091f2984e4b07' 
  AND token = 'tkLkOvSeLxpbkU5Wk6TI0kPVJopV6UHFAuqK5X31dDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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