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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab00be0a74f1496d8babfec276cc68ac069c94dfe016d61bc23cc58aa9e11a2b' 
  AND token = 'cWX9yRWSw3MEh6V0G7+a6Efv55DMPLoRtekBQcYMR6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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