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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0fd99be47ec77a77d4d1b6904e5d31ce8ad62e2fb25a699eb0a42338d7a7ed26' 
  AND token = 'fh7k0i4ORaIN/VtazrumoCh8V7uxhxnis/yYNuGoGa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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