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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a0f59e49d6a0cbd02932e527ddfdf90f23ef4ddebe1fa5aab51c429edf042580' 
  AND token = '9te/iTkczWEiW7zPwDfKYXqRgIc/rAJAxqM+V6Cj4+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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