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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba62b491117350c4cb1ad538b74f236b2422089d380aec3f2db9ca3f42450402' 
  AND token = '1brmIsSWNw78qMyVQ9nFpY2F8BuJ8Z8P7migt6blPos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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