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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47a198762abbea6176e3b56ca3ddaac33ec5cc181cef9e4e1c5368e9fab119a1' 
  AND token = 'Sru9PsvJjJB+iyqM6I3DO60Tpj1sJJCwYTSAl2677Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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