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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bbea0b0d99354fbd556773f4422bea3dc2ef9fce0fb63e5fab40020e4872054f' 
  AND token = '7qt4Ft7WKskzzEd3PpDyhGDih/jsiAAVNDMV64vpZSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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