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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2f48368dacb1416a62a3fc37ca4703bee2a6d37c534342b1883e2f72de672fe5' 
  AND token = 'yocuo9N5rg4ENAdAkqqE3f4wcpkiWP4Hd2d/WA425r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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