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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '69234b71613f19d04defed9617fabadf471d1ce98d011b01ed87cd26008c6ecb' 
  AND token = 'bjVAFMiFOyoNpKEklMIZ1WG0NeQWQuwpccSFCATmalE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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