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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7affaa7f1fdea7e986d1e1f0975a3ea7867c44f401026efba9855689fe8b8665' 
  AND token = 'YvkWb3tWY9K0jbRvUVIjzOpf1qlBg7lP44qi8SONMBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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